package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private DishMapper dishMapper;

    @Transactional
    @Override
    public void saveWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmealMapper.insert(setmeal);
        Long setmealId = setmeal.getId();
        //遍历setmealDish对套餐id赋值
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(
                setmealDish -> {
                    setmealDish.setSetmealId(setmealId);
                }
        );
        //批量插入  保存套餐和菜品的关联关系
        setmealDishMapper.insertBatch(setmealDishes);


    }

    @Override
    public PageResult page(SetmealPageQueryDTO setmealPageQueryDTO) {
        int pageNum = setmealPageQueryDTO.getPage();
        int pageSize = setmealPageQueryDTO.getPageSize();
        PageHelper.startPage(pageNum, pageSize);
        Page<SetmealVO> setmeals = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(setmeals.getTotal(), setmeals.getResult());
    }

    /**
     *
     * 批量删除套餐
     * @param ids
     */
    @Override
    public void deleteBatch(List<Long> ids) {

        //起售中的套餐不能删除(检验)
        ids.forEach(
                id -> {
                    Setmeal setmeal = setmealMapper.getById(id);
                    //起售中
                    if(setmeal.getStatus() == StatusConstant.ENABLE) {
                        //起售中抛异常不能删
                        throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
                    }
                }
        );
        //删除套餐
        setmealMapper.deleteBatch(ids);
        //删除套餐菜品
        setmealDishMapper.deleteBatch(ids);
    }

    /**
     * 根据id查询套餐，用于修改页面回显数据
     *
     * @param id
     * @return
     */
    @Override
    public SetmealVO getWithDishById(Long id) {
        //根据id查询套餐
        Setmeal setmeal = setmealMapper.getById(id);
        //根据id查询套餐关联菜品
        List<SetmealDish> setmealDishs = setmealDishMapper.getAllBySetmealId(id);

        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishs);
        return setmealVO;
    }

    /**
     *
     * 修改套餐信息
     * @param setmealDTO
     */

    @Transactional
    @Override
    public void update(SetmealDTO setmealDTO) {
        //修改套餐参数信息
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        //修改菜品列表
        setmealMapper.update(setmeal);
        Long setmealId = setmeal.getId();
        //先删除
        setmealDishMapper.delete(setmealId);
        //再依次添加
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if(setmealDishes != null && !setmealDishes.isEmpty()) {
            setmealDishes.forEach(
                    setmealDish ->{
                        setmealDish.setSetmealId(setmealId);
                    }
            );
            setmealDishMapper.insertBatch(setmealDishes);
        }
    }

    @Override
    public void startOrStop(Integer status, Long setmealId) {

        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if(status == StatusConstant.ENABLE){
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(setmealId);
            if(dishList != null && dishList.size() > 0){
                dishList.forEach(dish -> {
                    if(StatusConstant.DISABLE == dish.getStatus()){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                .id(setmealId)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
